Jury selection began Monday in the latest legal battle between the fiercest rivals in the world of smartphones, with Apple and Samsung accusing each other, once again, of ripping off designs and features.

The trial in Silicon Valley marks the latest round in a series of lawsuits between the two tech giants that underscores a much larger concern about what is allowed to be patented.

“There’s a widespread suspicion that lots of the kinds of software patents at issue are written in ways that cover more ground than what Apple or any other tech firm actually invented,” Notre Dame law professor Mark McKenna said. “Overly broad patents allow companies to block competition.”

The latest Apple-Samsung case will be tried less than two years after a federal jury found Samsung was infringing on Apple patents. Samsung was ordered to pay about $900 million but is appealing and has been allowed to continue selling products using the technology.

Dozens of attorneys gathered in U.S. District Court for the latest legal skirmish in which Apple Inc. accuses Samsung of infringing on five patents on newer devices, including Galaxy smartphones and tablets. In a counterclaim, Samsung says Apple stole two of its ideas to use on iPhones and iPads.

Casey Neistat admits that the logistics of running a business isn’t his speciality. Instead, he shared with Denver Startup Week audiences how he went from high school dropout to an HBO show, a New York Times partnership and later, an app that got started while on a fellowship at the Massachusetts Institute of Technology.

Twitter is defending its decision not to remove a controversial tweet by President Donald Trump on Saturday that targeted North Korea, in a six-tweet response to critics who argued that Trump violated the platform’s rules.